Gas Fitter Practice Test

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What size should a grill be if it is 80% free air space and serves 3 hot water boilers each firing at 500MBH, 2 hot water heaters firing at 270MBH, and 1 domestic hot water heater firing at 30MBH?

275 sq in
300 sq in
1200 sq in
240 sq in

The correct answer is: 275 sq in

To determine the proper size for the grill in this scenario, we need to calculate the total gas input requirements for all the appliances that the grill serves and then apply the appropriate formula based on the percentage of free air space. First, we need to sum the BTU/hr (British Thermal Units per hour) ratings of all the appliances: - Three hot water boilers at 500 MBH each contribute a total of 1,500 MBH (3 x 500). - Two hot water heaters at 270 MBH each contribute a total of 540 MBH (2 x 270). - One domestic hot water heater at 30 MBH contributes 30 MBH. Now, we add these values together: 1,500 MBH (boilers) + 540 MBH (heaters) + 30 MBH (domestic heater) = 2,070 MBH total. For venting calculations, especially with a grill being 80% free air space, we understand that the free area must be adjusted to account for this percentage. The required grill size can be calculated using a rule of thumb. Typically, a certain amount of square inches of grill area is needed per MBH of gas. Various codes provide